הִנֵּה֩ הַיּ֨וֹם הַזֶּ֜ה רָא֣וּ עֵינֶ֗יךָ אֵ֣ת אֲשֶׁר־נְתָנְךָ֩ יְהוָ֨ה ׀ הַיּ֤וֹם ׀ בְּיָדִי֙ בַּמְּעָרָ֔ה וְאָמַ֥ר לַהֲרָגֲךָ֖ וַתָּ֣חָס עָלֶ֑יךָ וָאֹמַ֗ר לֹא־אֶשְׁלַ֤ח יָדִי֙ בַּֽאדֹנִ֔י כִּי־מְשִׁ֥יחַ יְהוָ֖ה הֽוּא׃
Behold, this day thine eyes have seen how that the LORD had delivered thee to-day into my hand in the cave; and some bade me kill thee; but mine eye spared thee; and I said: I will not put forth my hand against my lord; for he is the LORD’S anointed.
Mishnah Rosh Hashanah
If one who has seen the new moon and is not able to walk [to Jerusalem] on foot, he may be brought on a donkey or even in a litter [on Shabbat]. If they [the witnesses] are likely to be attacked, they may take sticks [to defend themselves]. If the distance is great [to Jerusalem], they may take provisions with them, since for as much as a night and a day’s journey they were allowed to profane Shabbat and go out to testify concerning the new moon, as it says: “These are the appointed times of the Lord … which you shall proclaim at their appointed time” (Leviticus 23:4).